/* =============================================================
   索思芯炬小课堂 · 卡通 UI 全局样式
   糖果色 / 圆滚滚 / 手绘感 —— 给小朋友的快乐小站
   ============================================================= */

:root {
  /* 糖果配色 */
  --coral: #ff6b6b;
  --orange: #ffa502;
  --yellow: #ffd93d;
  --green: #6bcb4d;
  --mint: #4fd1c5;
  --blue: #4d96ff;
  --deep: #2b5fd9;
  --purple: #a06ee1;
  --pink: #ff8fb1;

  --ink: #3a4466;
  --ink-soft: #6b7698;
  --cream: #fff9ee;
  --paper: #ffffff;
  --line: #ffe3b3;

  --radius-lg: 28px;
  --radius-md: 20px;
  --font: "PingFang SC", "Microsoft YaHei", "Comic Sans MS", "Segoe UI", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.9;
  background-image: radial-gradient(rgba(255, 165, 2, .10) 1.6px, transparent 1.6px);
  background-size: 26px 26px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
b, strong { font-weight: 800; }

.container { width: min(1080px, 92%); margin: 0 auto; }
.center { text-align: center; }
.lead { color: var(--ink-soft); }
.note { color: #a49a86; font-size: .92rem; margin-top: 26px; }
.note b { color: var(--orange); }

/* ============ 卡通导航栏 ============ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding-top: 12px; transition: .3s;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  background: #fffdf6; border: 3px solid #fff;
  box-shadow: 0 6px 0 rgba(154, 130, 60, .18), 0 14px 26px rgba(43, 95, 217, .10);
  border-radius: 999px; height: 62px; padding: 0 18px;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand-mark {
  width: 38px; height: 38px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--yellow), var(--orange));
  border-radius: 50%; font-size: 1.25rem;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, .12), 0 3px 6px rgba(255, 165, 2, .4);
  animation: sunSpin 14s linear infinite;
}
@keyframes sunSpin { to { transform: rotate(360deg); } }
.brand-text { font-weight: 900; font-size: 1.06rem; color: var(--deep); }
.nav-links { display: flex; gap: 6px; }
.nav-links a {
  color: var(--ink); font-weight: 700; font-size: .95rem;
  padding: 6px 14px; border-radius: 999px; transition: .2s;
}
.nav-links a:hover { background: #fff1d6; color: var(--orange); transform: translateY(-2px); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 3px; background: var(--deep); margin: 4px 0; border-radius: 3px; transition: .3s; }

/* ============ 卡通首页 Hero ============ */
.hero {
  position: relative; overflow: hidden; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 130px 0 70px;
  background: linear-gradient(180deg, #9ed8ff 0%, #c9ecff 52%, #fff2d9 100%);
}
/* 漂浮装饰 */
.deco { position: absolute; user-select: none; pointer-events: none; z-index: 1; }
.deco-sun { top: 6%; right: 7%; font-size: 84px; filter: drop-shadow(0 6px 10px rgba(255,165,2,.5)); animation: bob 5s ease-in-out infinite; }
.deco-cloud { font-size: 74px; opacity: .95; filter: drop-shadow(0 8px 12px rgba(43,95,217,.12)); }
.deco-cloud.c1 { top: 12%; left: 6%; animation: drift 22s linear infinite; }
.deco-cloud.c2 { top: 46%; left: -2%; font-size: 58px; animation: drift 30s linear infinite reverse; }
.deco-cloud.c3 { top: 20%; right: 26%; font-size: 46px; animation: drift 26s linear infinite; }
.deco-balloon { font-size: 52px; animation: balloon 6s ease-in-out infinite; }
.deco-balloon.b1 { bottom: 24%; left: 8%; }
.deco-balloon.b2 { top: 30%; right: 4%; font-size: 42px; animation-delay: 1.2s; }
.deco-star.s1 { top: 18%; left: 20%; font-size: 34px; animation: twinkle 2.4s ease-in-out infinite; }
.deco-star.s2 { bottom: 18%; right: 16%; font-size: 28px; animation: twinkle 2.4s ease-in-out .6s infinite; }
.deco-rainbow { bottom: 10%; left: 14%; font-size: 64px; animation: bob 7s ease-in-out infinite; }
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }
@keyframes drift { from { transform: translateX(-40px); } to { transform: translateX(60px); } }
@keyframes balloon {
  0%,100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-22px) rotate(4deg); }
}
@keyframes twinkle { 0%,100% { opacity: 1; } 50% { opacity: .3; } }

.hero-content { position: relative; z-index: 2; text-align: center; max-width: 860px; }
.hero-welcome {
  display: inline-block; background: #fff; color: var(--coral); font-weight: 900;
  font-size: 1.05rem; padding: 8px 22px; border-radius: 999px;
  border: 3px dashed var(--coral); margin-bottom: 24px;
  animation: wiggle 2.6s ease-in-out infinite;
}
@keyframes wiggle { 0%,100% { transform: rotate(-2deg);} 50% { transform: rotate(2deg);} }

.hero-title {
  font-size: clamp(2.9rem, 9vw, 5.2rem); font-weight: 900; line-height: 1.15;
  margin-bottom: 24px; letter-spacing: 3px; text-shadow: 0 4px 0 #fff;
}
.rc { display: inline-block; filter: drop-shadow(0 4px 0 rgba(0,0,0,.12)); transform-origin: 50% 90%; }
.rc:hover { animation: wiggleChar .5s ease; }
@keyframes wiggleChar { 0%,100%{ transform: rotate(0);} 40%{ transform: rotate(-12deg);} }
.c1 { color: var(--coral); } .c2 { color: var(--orange); } .c3 { color: var(--blue); }
.c4 { color: var(--green); } .c5 { color: var(--purple); }
.title-gap { display: inline-block; width: .35em; }

.hero-sub {
  font-size: 1.15rem; color: #40507a; background: rgba(255,255,255,.72);
  padding: 18px 26px; border-radius: var(--radius-md);
  border: 3px solid #fff; box-shadow: 0 8px 0 rgba(43,95,217,.12);
  margin-bottom: 22px;
}
.hero-sub b { color: var(--deep); }

.hero-fun { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 30px; }
.hero-fun li {
  background: #fff; border-radius: 999px; padding: 6px 18px; font-weight: 700;
  font-size: .95rem; color: var(--ink); border: 3px solid #fff;
  box-shadow: 0 5px 0 rgba(0,0,0,.10); transition: .2s; cursor: default;
}
.hero-fun li:nth-child(1) { border-color: var(--coral); }
.hero-fun li:nth-child(2) { border-color: var(--orange); }
.hero-fun li:nth-child(3) { border-color: var(--purple); }
.hero-fun li:nth-child(4) { border-color: var(--green); }
.hero-fun li:nth-child(5) { border-color: var(--blue); }
.hero-fun li:nth-child(6) { border-color: var(--pink); }
.hero-fun li:nth-child(7) { border-color: var(--mint); }
.hero-fun li:nth-child(8) { border-color: var(--yellow); }
.hero-fun li:hover { transform: translateY(-5px) rotate(-2deg); }

/* 按钮（厚厚 Q 弹的糖果按钮） */
.btn {
  display: inline-block; border: 0; cursor: pointer; font-family: var(--font);
  font-weight: 900; font-size: 1.02rem; padding: 14px 30px; border-radius: 999px;
  transition: transform .15s, box-shadow .15s;
}
.btn-primary {
  color: #6b3d00;
  background: linear-gradient(180deg, #ffe066, var(--yellow));
  box-shadow: 0 7px 0 #e0a400, 0 12px 20px rgba(255, 165, 2, .35);
  border: 3px solid #fff;
}
.btn-primary:hover { transform: translateY(-3px) scale(1.03); box-shadow: 0 10px 0 #e0a400, 0 16px 26px rgba(255,165,2,.4); }
.btn-primary:active { transform: translateY(3px); box-shadow: 0 3px 0 #e0a400; }
.btn-ghost {
  color: var(--deep); background: #fff;
  box-shadow: 0 7px 0 #cbd9ff, 0 12px 20px rgba(43,95,217,.15); border: 3px solid #fff;
}
.btn-ghost:hover { transform: translateY(-3px) scale(1.03); }
.btn-ghost:active { transform: translateY(3px); box-shadow: 0 3px 0 #cbd9ff; }
.hero-actions { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }

.hero-scroll-link {
  position: absolute; bottom: 22px; left: 50%; transform: translateX(-50%);
  z-index: 2; width: 46px; height: 46px; display: grid; place-items: center;
  background: #fff; border-radius: 50%; font-size: 1.4rem; color: var(--blue);
  box-shadow: 0 6px 0 rgba(43,95,217,.2); animation: bob 1.6s ease-in-out infinite;
}

/* ============ 通用 section ============ */
.section { padding: 96px 0; position: relative; }
.section-alt { background: linear-gradient(#fff2d9, #fdeecf); }

.kicker {
  display: inline-block; background: #fff; color: var(--orange); font-weight: 900;
  padding: 6px 20px; border-radius: 999px; letter-spacing: 2px; font-size: .9rem;
  border: 3px dashed var(--orange); margin-bottom: 18px;
}
.kicker.center { display: inline-block; }
h2 { font-size: clamp(1.7rem, 4vw, 2.4rem); font-weight: 900; color: var(--ink); }
h2.center + .lead { margin-top: 10px; }
h3 { font-weight: 900; }

/* 彩虹波浪下划线 */
h2 { position: relative; }
h2::after {
  content: ""; display: block; height: 12px; width: 190px; margin: 8px auto 0;
  border-radius: 999px;
  background: repeating-linear-gradient(90deg,
    var(--coral) 0 24px, var(--yellow) 0 48px,
    var(--green) 0 72px, var(--blue) 0 96px, var(--purple) 0 120px);
  animation: rainbowMove 3s linear infinite;
  background-size: 120px 100%;
}
@keyframes rainbowMove { to { background-position: 120px 0; } }

/* ============ “纸片” 简介 ============ */
.paper {
  background: var(--paper); border: 3px solid var(--line);
  border-radius: var(--radius-lg); padding: 40px 42px; margin-top: 42px;
  box-shadow: 0 10px 0 #ffe9c2, 0 22px 40px rgba(154, 130, 60, .16);
  font-size: 1.08rem; color: #4a547a; position: relative;
}
.paper::before {
  content: "📎"; position: absolute; top: -16px; left: 50%; transform: translateX(-50%);
  font-size: 1.8rem; background: var(--cream); padding: 0 10px; border-radius: 8px;
}
.paper b { color: var(--deep); }
.paper-icon { text-align: center; font-size: 1.6rem; margin: 14px 0 8px; letter-spacing: 8px; }
.intro-list { margin-top: 14px; }
.intro-list li {
  display: flex; align-items: center; gap: 12px; padding: 10px 0;
  border-bottom: 2px dashed #ffe3b3; font-size: 1rem;
}
.intro-list li:last-child { border-bottom: 0; }
.intro-list li b { color: var(--deep); }
.dot { width: 14px; height: 14px; border-radius: 50%; flex: 0 0 auto; box-shadow: 0 3px 0 rgba(0,0,0,.15); }
.dot-1 { background: var(--coral); } .dot-2 { background: var(--purple); }
.dot-3 { background: var(--green); } .dot-4 { background: var(--blue); }

/* ============ 四大乐园卡片 ============ */
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; margin-top: 46px; }
.pg-card {
  background: #fff; border-radius: var(--radius-lg); padding: 30px 22px 26px;
  text-align: center; display: flex; flex-direction: column; align-items: center; gap: 8px;
  border: 4px solid #fff; position: relative;
  box-shadow: 0 9px 0 rgba(0,0,0,.08), 0 20px 34px rgba(58, 68, 102, .12);
  transition: transform .25s, box-shadow .25s;
}
.pg-card:hover { transform: translateY(-8px) rotate(-1deg); }
.pg-card:nth-child(even):hover { transform: translateY(-8px) rotate(1deg); }
.pg-red { border-top: 12px solid var(--coral); }
.pg-purple { border-top: 12px solid var(--purple); }
.pg-green { border-top: 12px solid var(--green); }
.pg-blue { border-top: 12px solid var(--blue); }
.pg-emoji { font-size: 3.2rem; line-height: 1; filter: drop-shadow(0 6px 6px rgba(0,0,0,.12)); animation: bob 3.4s ease-in-out infinite; }
.pg-card:nth-child(2) .pg-emoji { animation-delay: .5s; }
.pg-card:nth-child(3) .pg-emoji { animation-delay: 1s; }
.pg-card:nth-child(4) .pg-emoji { animation-delay: 1.5s; }
.pg-card h3 { font-size: 1.25rem; color: var(--ink); }
.pg-card p { color: var(--ink-soft); font-size: .92rem; flex: 1; }
.badge-soon {
  background: #fff1d6; color: var(--orange); font-size: .78rem; font-weight: 800;
  padding: 3px 12px; border-radius: 999px; border: 2px dashed var(--orange);
}
.btn-card {
  margin-top: 6px; font-size: .95rem; padding: 9px 26px;
  color: #fff; box-shadow: 0 5px 0 rgba(0,0,0,.2);
}
.pg-red .btn-card { background: var(--coral); }
.pg-purple .btn-card { background: var(--purple); }
.pg-green .btn-card { background: var(--green); }
.pg-blue .btn-card { background: var(--blue); }
.btn-card:hover { transform: translateY(-2px) scale(1.04); }
.btn-card:active { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,.2); }

/* ============ 页脚 ============ */
.footer {
  background: linear-gradient(180deg, #2b5fd9, #1d3f9e); color: #dbe7ff;
  text-align: center; padding: 40px 0 46px;
  border-top: 6px solid var(--yellow);
  background-image: radial-gradient(rgba(255,255,255,.25) 1.4px, transparent 1.4px);
  background-size: 22px 22px;
}
.footer-brand { color: #fff; font-weight: 900; font-size: 1.2rem; margin-bottom: 4px; }
.footer-tip { margin-top: 6px; color: #9fb6f0; font-size: .92rem; }

/* ============ 气泡提示 ============ */
.toast {
  position: fixed; left: 50%; bottom: 44px; transform: translate(-50%, 24px);
  background: #fff; color: var(--deep); font-weight: 800; font-size: 1rem;
  padding: 14px 28px; border-radius: 999px; z-index: 300;
  border: 4px solid var(--orange); box-shadow: 0 10px 30px rgba(0,0,0,.22);
  opacity: 0; pointer-events: none; transition: .35s; max-width: 92vw; text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============ 滚动显现 ============ */
.reveal { opacity: 0; transform: translateY(30px) scale(.98); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0) scale(1); }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .cards-4 { grid-template-columns: repeat(2, 1fr); }
  .paper { padding: 30px 22px; }
}
@media (max-width: 560px) {
  .cards-4 { grid-template-columns: 1fr; }
  .nav-links {
    position: fixed; top: 74px; right: 14px; left: 14px;
    background: #fffdf6; border-radius: 22px; flex-direction: column; gap: 2px;
    padding: 14px; box-shadow: 0 12px 30px rgba(0,0,0,.2);
    transform: translateY(-16px); opacity: 0; pointer-events: none; transition: .3s;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 12px 16px; border-radius: 14px; }
  .nav-toggle { display: block; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ============ 乐园子页小横幅 ============ */
.page-hero {
  position: relative; overflow: hidden; text-align: center;
  padding: 150px 0 66px;
  background: linear-gradient(180deg, #9ed8ff 0%, #cdeeff 58%, #fff2d9 100%);
}
.hero-title.small { font-size: clamp(2.5rem, 7vw, 4rem); margin-bottom: 20px; }
.nav-links a.active {
  background: linear-gradient(#ffe066, var(--yellow)); color: #6b3d00;
  box-shadow: 0 3px 0 #e0a400;
}

/* ============ 分类筛选小按钮 ============ */
.exp-area { padding: 50px 0 90px; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 42px; }
.chip {
  font-family: var(--font); font-weight: 900; font-size: .98rem; cursor: pointer;
  background: #fff; color: var(--ink); padding: 10px 22px; border-radius: 999px;
  border: 3px solid #fff; box-shadow: 0 5px 0 rgba(0, 0, 0, .10); transition: .18s;
}
.chip:hover { transform: translateY(-2px); }
.chip.active {
  background: linear-gradient(#ffe066, var(--yellow)); color: #6b3d00;
  box-shadow: 0 5px 0 #e0a400;
}

/* ============ 实验卡片 ============ */
.exp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.exp-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 4px solid #fff; position: relative;
  box-shadow: 0 9px 0 rgba(0, 0, 0, .08), 0 20px 34px rgba(58, 68, 102, .10);
}
.exp-card::before { content: ""; display: block; height: 12px; background: var(--ec, #ffa502); }
.exp-top { display: flex; align-items: center; gap: 14px; padding: 20px 22px 4px; }
.exp-emoji { font-size: 2.7rem; line-height: 1; filter: drop-shadow(0 5px 5px rgba(0, 0, 0, .14)); }
.exp-title { flex: 1; }
.exp-tag {
  display: inline-block; font-size: .72rem; font-weight: 900; color: #fff;
  background: var(--ec, #ffa502); padding: 2px 12px; border-radius: 999px; margin-bottom: 4px;
}
.exp-title h3 { font-size: 1.32rem; color: var(--ink); }
.exp-num { font-size: 1.7rem; font-weight: 900; color: #efe4d0; }
.exp-q {
  margin: 10px 22px 14px; background: #fff6e0; border: 2px dashed #f0c15f;
  border-radius: 14px; padding: 10px 14px; font-weight: 700; font-size: .97rem; color: #8a6a1f;
}
.exp-open-wrap { padding: 0 22px 22px; }
.btn-open {
  color: #fff; background: var(--ec, #ffa502); padding: 11px 24px; font-size: .96rem;
  box-shadow: 0 5px 0 rgba(0, 0, 0, .22);
}
.btn-open:hover { transform: translateY(-2px); }
.btn-open:active { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0, 0, 0, .22); }
.exp-card.open .btn-open { display: none; }

.exp-detail { display: none; border-top: 2px dashed #ffe3b3; }
.exp-card.open .exp-detail { display: block; padding: 4px 22px 26px; animation: expIn .35s ease; }
@keyframes expIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
.exp-label { font-weight: 900; margin: 14px 0 8px; color: var(--ink); }
.exp-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.exp-chips span {
  background: #eef4ff; color: #3a5ba8; border: 2px solid #d7e4ff;
  padding: 4px 13px; border-radius: 999px; font-size: .86rem; font-weight: 700;
}
.exp-steps { display: none; }
.exp-steps.show { display: block; }
.exp-steps ol { padding-left: 24px; }
.exp-steps li { margin-bottom: 9px; font-size: .97rem; color: #4a547a; }
.exp-steps li::marker { color: var(--ec, #ffa502); font-weight: 900; }
.row-btn { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.btn-ghost-sm {
  font-family: var(--font); font-weight: 900; font-size: .9rem; cursor: pointer;
  background: #fff; color: #3a4466; border: 3px solid #cfd8ea; border-radius: 999px;
  padding: 9px 18px; box-shadow: 0 4px 0 rgba(0, 0, 0, .06); transition: .15s;
}
.btn-ghost-sm:hover { transform: translateY(-2px); border-color: var(--ec, #ffa502); color: var(--ec, #ffa502); }
.btn-ghost-sm:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(0, 0, 0, .06); }

.exp-answer {
  display: none; margin-top: 16px; padding: 16px 18px;
  background: linear-gradient(#fffbe8, #fff3d6);
  border: 3px solid var(--yellow); border-radius: var(--radius-md);
}
.exp-answer.show { display: block; animation: popIn .45s ease; }
@keyframes popIn { from { transform: scale(.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.exp-answer .exp-label { margin-top: 0; color: #8a5a00; }
.exp-answer p { font-size: .97rem; color: #6b4a00; }
.exp-answer b { color: #c24d0c; }

/* 已开放的乐园角标 */
.badge-open { background: #e7f8e9; color: #2e9e4f; border-color: #2e9e4f; }

@media (max-width: 820px) {
  .exp-grid { grid-template-columns: 1fr; }
}

/* =============================================================
   手工展示墙（画廊）+ 儿歌小天地 —— 第三点
   ============================================================= */

/* ---------- 子页主题色渐变 ---------- */
.page-hero-purple {
  background: linear-gradient(180deg, #d9c9ff 0%, #ede4ff 55%, #fff2d9 100%);
}
.page-hero-green {
  background: linear-gradient(180deg, #bff0e0 0%, #d6f5ea 55%, #fff2d9 100%);
}

/* ---------- 手工展示墙：照片墙 ---------- */
.gallery-area { padding: 50px 0 90px; }
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-top: 46px; }
.gallery-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 4px solid #fff; position: relative; cursor: pointer;
  box-shadow: 0 9px 0 rgba(0, 0, 0, .08), 0 20px 34px rgba(58, 68, 102, .12);
  transition: transform .25s, box-shadow .25s;
}
.gallery-card:hover { transform: translateY(-8px) rotate(-1deg); box-shadow: 0 12px 0 rgba(0, 0, 0, .06), 0 24px 40px rgba(58, 68, 102, .16); }
.gallery-card:nth-child(even):hover { transform: translateY(-8px) rotate(1deg); }
.gallery-thumb {
  height: 170px; display: grid; place-items: center;
  background: var(--gb, linear-gradient(135deg, #a06ee1, #ff8fb1));
  position: relative;
}
.gallery-thumb .g-emoji { font-size: 4.2rem; filter: drop-shadow(0 8px 10px rgba(0, 0, 0, .18)); animation: bob 3.4s ease-in-out infinite; }
.gallery-thumb img { width: 100%; height: 100%; object-fit: cover; }
.gallery-info { padding: 16px 18px 18px; text-align: center; }
.gallery-info h3 { font-size: 1.12rem; color: var(--ink); }

/* ---------- 灯箱（点开看大图） ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(30, 36, 66, .58); backdrop-filter: blur(3px);
  display: grid; place-items: center; padding: 24px;
  opacity: 0; pointer-events: none; transition: opacity .3s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox-card {
  background: #fff; border-radius: var(--radius-lg); max-width: 460px; width: 100%;
  text-align: center; padding: 40px 30px 32px; position: relative;
  border: 5px solid #fff; box-shadow: 0 20px 60px rgba(0, 0, 0, .35);
  animation: popIn .4s ease;
}
.lightbox-card .lb-emoji { font-size: 5.5rem; line-height: 1.2; filter: drop-shadow(0 10px 12px rgba(0, 0, 0, .16)); }
.lightbox-card .lb-img { width: 100%; max-height: 300px; object-fit: cover; border-radius: 16px; }
.lightbox-card h3 { font-size: 1.5rem; margin-top: 10px; color: var(--ink); }
.lightbox-card .lb-desc { color: #4a547a; font-size: .98rem; margin-top: 10px; }
.lightbox-close {
  position: absolute; top: 14px; right: 14px; width: 42px; height: 42px;
  border-radius: 50%; border: 0; cursor: pointer; font-size: 1.2rem; font-weight: 900;
  background: #f1f3fb; color: var(--ink); transition: .2s;
}
.lightbox-close:hover { background: var(--coral); color: #fff; transform: rotate(90deg); }

/* ---------- 儿歌小天地 ---------- */
.song-area { padding: 50px 0 90px; }
.song-card {
  background: #fff; border-radius: var(--radius-lg); padding: 38px 40px;
  border: 4px solid #fff; box-shadow: 0 9px 0 rgba(0, 0, 0, .08), 0 20px 34px rgba(58, 68, 102, .12);
  margin-top: 40px; text-align: center;
}
.song-title { font-size: 1.8rem; font-weight: 900; color: var(--green); }
.song-singer { color: var(--ink-soft); margin-top: 4px; }
.song-player {
  margin: 26px auto 0; max-width: 460px; background: #f3fbf6;
  border: 3px dashed var(--green); border-radius: var(--radius-lg); padding: 24px 22px;
}
.player-btn {
  width: 76px; height: 76px; border-radius: 50%; border: 4px solid #fff; cursor: pointer;
  background: linear-gradient(180deg, #8fe06a, var(--green)); color: #fff; font-size: 1.9rem;
  box-shadow: 0 7px 0 #3f9c30, 0 12px 22px rgba(107, 203, 77, .35); transition: .15s;
}
.player-btn:hover { transform: scale(1.05); }
.player-btn:active { transform: translateY(4px); box-shadow: 0 2px 0 #3f9c30; }
.player-btn.playing { background: linear-gradient(180deg, #ffb3b3, var(--coral)); box-shadow: 0 7px 0 #d24c4c, 0 12px 22px rgba(255, 107, 107, .35); }
.player-hint { margin-top: 14px; color: var(--ink-soft); font-size: .92rem; }
.player-bar {
  margin-top: 18px; height: 12px; border-radius: 999px; background: #e2efe8; overflow: hidden; position: relative;
}
.player-bar .player-fill { height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, var(--mint), var(--green)); transition: width .25s; }
.player-time { display: flex; justify-content: space-between; margin-top: 8px; font-size: .82rem; color: var(--ink-soft); font-weight: 700; }

/* ---------- 歌词 ---------- */
.lyrics { margin-top: 44px; text-align: left; }
.lyric-block {
  background: #fff; border-radius: var(--radius-lg); padding: 28px 32px; margin-bottom: 22px;
  border: 4px solid #fff; box-shadow: 0 9px 0 rgba(0, 0, 0, .08), 0 20px 34px rgba(58, 68, 102, .10);
}
.lyric-block.chorus { border-color: var(--green); background: #f6fcf4; }
.lyric-label {
  display: inline-block; font-weight: 900; font-size: .82rem; letter-spacing: 1px;
  color: #fff; background: var(--green); padding: 3px 14px; border-radius: 999px; margin-bottom: 14px;
}
.lyric-block.chorus .lyric-label { background: var(--orange); }
.lyric-block p { font-size: 1.06rem; line-height: 2.2; color: #4a547a; }
.lyric-block.chorus p { color: #2e6b2e; font-weight: 700; }
.lyric-block p b { color: var(--deep); }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .gallery-grid { grid-template-columns: 1fr; }
  .song-card, .lyric-block { padding: 24px 20px; }
}

/* =============================================================
   实践故事（蓝色主题）
   ============================================================= */
.page-hero-blue {
  background: linear-gradient(180deg, #bcd8ff 0%, #d7e7ff 55%, #fff2d9 100%);
}
.story-area { padding: 50px 0 90px; }
.story-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; margin-top: 46px; }
.story-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 4px solid #fff; box-shadow: 0 9px 0 rgba(0, 0, 0, .08), 0 20px 34px rgba(58, 68, 102, .12);
  transition: transform .25s, box-shadow .25s;
}
.story-card:hover { transform: translateY(-8px) rotate(-1deg); }
.story-card:nth-child(even):hover { transform: translateY(-8px) rotate(1deg); }
.story-photo { height: 220px; overflow: hidden; background: #eef4ff; }
.story-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.story-photo-empty { height: 100%; border: 3px dashed #bcd4ff; background: #f4f8ff; }
.story-body { padding: 22px 24px 26px; }
.story-body h3 { font-size: 1.2rem; color: var(--ink); }
.story-body p { color: #4a547a; font-size: .96rem; margin-top: 8px; }
@media (max-width: 820px) {
  .story-grid { grid-template-columns: 1fr; }
}